[c64] [c16] [cplus4] [c128] [x16] [m65]

Sets the horizontal smooth scrolling value.

' On all Commodore platforms and the MEGA65:
HSCROLL <px>
' On the Commander X16:
HSCROLL <layer>, <px> 

• On [c64] [c16] [cplus4] [c128] [m65], <px> is a value between 0 and 7. After this operation, the screen will be moved <px> pixels to the right.
• On the [x16], <layer> is a literal 0 or 1 specifying which layer to scroll. <px> is a value between 0 and 4095

• VSCROLL